from what I recall at the time, the consensus was that another vehicle was involved and that there wasn't enough road for the both of them, and unless they can conclusively and definitely disprove that or prove clear negligence on his part, I doubt they'll get a conviction anyway.
Meanwhile, I don't see how the justice system can possibly punish him more than he already has been, if he's even half-way human, losing half his family is more punishment than anyone should have to deal with.